community day skins aren't recognized

[Zyga21]

System.FormatException: unknown asset library set 18 in packed data (this generally means new DLC that is not supported yet)
   at Gibbed.Borderlands2.FileFormats.AssetLibraryManagerHelpers.Lookup(AssetLibraryManager assetLibraryManager, PackedAssetReference packed, Platform platform, Int32 setId, AssetGroup group)
   at Gibbed.Borderlands2.FileFormats.Items.BaseItem.Unpack(PackedItem packed, Platform platform)
   at Gibbed.Borderlands2.FileFormats.Items.PackedDataHelper`2.Decode(Byte[] data, Platform platform)
   at Gibbed.Borderlands2.SaveEdit.BackpackViewModel.ImportData(WillowTwoPlayerSaveGame saveGame, Platform platform)

I have a save file with a community day skin on it and gibbed wont recognize it and asks me to delete it every time I load the save.